Presentations

• PHaSER Open House  Presentation 27 September 2023, NASA GSFC. 

Observation and Modeling of Vertical Coupling in the Atmosphere- Ionosphere System

Last updated: 2019

The full list of talks will be updated soon. 

Here I list invited talks, contributed talks, and contributed posters separately. All entries are in reverse chronological order. 

Summary: 29 Invited talks, 41 contributed talks, and 16 posters. 

Invited Talks

1. Yiğit, E., Modeling and observation of gravity waves in the thermosphere- ionosphere system, EGU, Vienna, Austria, April 2019.

2. Yiğit, E., Processes among large/meso/small scales, including the role of small-scale gravity waves on the I-T system, CEDAR Workshop, Santa Fe, USA, July 2018. 

3. Yiğit, E., T. Nakamura, C. Stolle, Recent progress on "Coupling by Dynamics" - ROSMIC/VarSITI, EGU, Vienna, Austria, April 2018.  

4. Yiğit, E., A. S. Medvedev, Interaction of small-scale gravity waves with the diurnal tide from the mesosphere to the upper thermosphere, Second VarSITI General Symposium, Irkutsk, Russia, 10–15 Jul 2017. 

5.  Yiğit, E., Effects of gravity waves and thermal tides in Earth’s middle and upper atmosphere, Seminar presentation, Kühlungsborn, Germany, 21 July 2017. 

6. Yiğit, E., Gravity waves and Martian CO2 ice clouds, MAVEN Telecon, 4 May 2017. 

7. Yiğit, E., A. S. Medvedev, Direct forcing of the thermosphere-ionosphere by small-scale gravity waves of lower atmospheric origin, International Beacon Satellite Symposium, Trieste, Italy, July 2016. 

8. Medvedev, A. S., and E. Yiğit, The Role and Importance of Gravity Waves in the Mesosphere and Thermosphere of Mars, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2015. 

9. Yiğit, E., Progress in understanding gravity wave effects in terrestrial and planetary upper atmospheres, Goethe University Frankfurt, Physics seminar, July 2015. 

10. Nakamura, T., E. Yiğit, C. Stolle, Coupling by dynamics in VarSITI/ROSMIC, 26th IUGG General Assembly, Prague, 22 June–2 July, 2015. 

11. Yiğit, E., Waves in terrestrial and planetary atmospheres, Max Planck Institute for Solar System Research, Seminar, May, 2015. 

12. Yiğit, E., Atmospheric coupling in the context of internal wave effects, United States Naval Observatory (USNO) Colloquium, May 2015. 

13. Yiğit,E.,Gravity-waveinducedverticalcouplingintheEarth’satmosphere,Physicsseminar,Kyushu University, Japan, Mar 2015. 

14. Yiğit, E., and A. S. Medvedev, Thermospheric effects of small-scale gravity waves during sudden stratospheric warmings, International CAWSES Symposium, Nagoya, Japan, 18-22 Nov 2013. 

15.   Ridley, A. J., D. Pawlowski, E. Yiğit, and E. Cousins, The thermospheric and ionospheric reaction to magnetospheric variability, International CAWSES Symposium, Nagoya, Japan, 18-22 Nov 2013. 

16. Yiğit, E., and A. S. Medvedev, Small-scale gravity waves in the thermosphere during a sudden stratospheric warming, IAGA Assembly, Merida, Mexico, Aug 2013. 

17. Yiğit, E., Propagation and dissipation of gravity waves from the tropopause to thermosphere at equinox: gravity wave drag vs. ion drag, CEDAR (Coupling, Energetics and Dynamics of Atmospheric Regions), Santa Fe, USA, June 2012. 

18. Ridley, A. J., J. Zhu, E. Yiğit, D. Drob, M. Conde, D. Pawlowski, The importance of large-scale wind measurements, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2011. 

19.  Yiğit, E., and A. S. Medvedev, Parameterizing gravity waves from the lower atmosphere to the thermosphere in general circulation models, Seminar talk, School of Engineering and Applied Science, Harvard University, Sept 2011. 

20. Yiğit, E., and A. J. Ridley, Effects of lower magnetic fields on the thermosphere-ionosphere, Sunspot Number Workshop, Sunspot, New Mexico, USA, Sept 2011. 

21. A. J. Ridley, X. Meng, G. Toth, and E. Yiğit, SWMF response to lower magnetic fields, Sunspot Number Workshop, Sunspot, New Mexico, USA, Sept 2011. 

22. Yiğit, E., and A. S. Medvedev, Modeling vertical coupling of the atmosphere-ionosphere system by gravity waves, IUGG (International Union for Geophysics and Geodesy), Melbourne, Australia, Jun-Jul 2011. 

23. Ridley, A. J., and E. Yiğit, Magnetospheric coupling to ionosphere/thermosphere models, AGU Chapman Conference on Modeling the Ionosphere/Thermosphere System, South Carolina, USA, May 2011. 

24. Yiğit, E., Coupling of the lower to the upper atmosphere via small-scale gravity waves, 4th IAGA/ICMA/ CAWSES-II TG4 Workshop on Vertical Coupling in the Atmosphere-Ionosphere System, Prague, Czech Republic, Feb 2011. 

25. Yiğit, E., Propagation of internal gravity waves from the lower to the upper atmosphere and modeling the resulting effects in coupled general circulation models, Seminar talk, Leibniz-Insitute of Atmospheric Physics, Ku ̈hlungsborn, Germany, Jan 2011. 

26. Yiğit, E., A. S. Medvedev, On the thermal and dynamical effects of small-scale gravity waves in the thermosphere-ionosphere system, 38th COSPAR Scientific Assembly, Bremen, Germany, July 2010. 

27. Yiğit, E., Wave-induced dynamics in the atmosphere and general circulation models, Departmental seminar, Department of Atmospheric Oceanic and Space Sciences, University of Michigan, Sept 2009. 

28. Yiğit, E., Atmospheric waves and non-local dynamical impact, National Center for Atmospheric Research, seminar presentation, Boulder, Colorado, USA, Mar 2007. 

29. Yiğit, E., Gravity waves in GCMs: Implementation and variability, Departmental seminar, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK, Feb 2007. 

Contributed Talks

1. Thiemann, E. M., N. Entin, S. Bougher, E. Yiğit, D. Pawlowski, F. Eparvier, Observations of an unidentified 0.4-1.8 day wave breaking in the Mars thermosphere, Ninth International Conference on Mars, Pasadena, California, July 2019. 

2. Bougher, S. W., M. Benna , Y. Lee , K. J. Roeten , E. Yiğit , P. R. Mahaffy, and B. Jakosky, Global circulation of the thermosphere of Mars as revealed by MAVEN/NGIMS measurements., Ninth International Conference on Mars, Pasadena, California, July 2019.  

3. Nayak, C., E. Yiğit, Variation of small scale gravity wave activity in the ionosphere during a major sudden stratospheric warming event of 2009, American Geophysical Union, Fall Meeting, Washington DC., Dec 2018. 

4. Panka, P. A. Kutepov, K. Kalogerakis, D. Janches, A. Feofilov, L. Rezac, D. Marsh, E. Yiğit, Nighttime O(3P) and OH densities in the MLT obtained by self-consistent two-channel retrievals from SABER/TIMED observations, EGU, Vienna, Austria, April 2018.   

5. Yiğit, E., A. S. Medvedev, Small-scale gravity wave effects on the thermospheric diurnal migrating tide, IAPSO/IAMAS/IAGA General Assembly, Cape Town, 27 Aug–1 Sept 2017. 

6. Kuroda, T., A. S. Medvedev, E. Yiğit, P. Hartogh, Global distribution and seasonal dependence of gravity wave fields in the Martian atmosphere simulated with a high-resolution general circulation model, IAPSO/IAMAS/IAGA General Assembly, Cape Town, 27 Aug–1 Sept 2017. 

7. Yiğit, E., A. S. Medvedev, P. Hartogh, T. Kuroda, Role of small-scale gravity waves on the formation and variability of high-altitude CO2 ice clouds in Martian atmosphere, Science Workshop on Mars from the Ground to the Upper Atmosphere, Brussels, Belgium, 21-23 Jun 2017. 

8. Medvedev, A. S., H. Nakagawa, E. Yiğit, T. Kuroda, P. Hartogh, IUVS team, Martian neutral density and temperature from MAVEN/IUVS observations and general circulation modeling, Science Workshop on Mars from the Ground to the Upper Atmosphere, Brussels, Belgium, 21-23 Jun 2017. 

9. Nakagawa, H., A. S. Medvedev, T. Kuroda, E. Yiğit, N. Terada, K. Terada, H. Fujiwara, C. Mockel, P. Hartogh, K. Seki, H. Gro ̈ller, R. V. Yelle, F. Montmessin, N. M. Schneider, J. I. Deighan, S. K. Jain , S. L. England, B. M. Jakosky, Global distribution of gravity wave activity in Martian lower thermosphere derived from MAVEN/IUVS stellar occultations and analyzed using two Martian General Circulation Models, Science Workshop on Mars from the Ground to the Upper Atmosphere, Brussels, Belgium, 21-23 Jun 2017. 

10. Moral, A. C., K. Shiokawa, H. Liu, S. Suzuki, Y. Otsuka, C. Yatini, E. Yiğit, A 630-nm airglow imager and the CHAMP satellite observations of low-latitude traveling ionospheric disturbances at Indonesia and comparison with a GCM simulation, CEDAR, Santa Fe, July 2017. 

11. Yiğit, E., A. S. Medvedev, P. Hartogh, L. Rezac, Global-scale time-dependent modeling of vertical coupling between electromagnetic processes, gravity waves, and CO2, SPP DynamicEarth Colloquium, Bremen, Germany, 15–18 Jun 2017. 

12. Yiğit, E., A. S. Medvedev, Role of small-scale gravity waves in the formation and variation of high- altitude CO2 ice clouds in the Martian atmosphere, International Conference on Mars Aeronomy, Boulder, CO, USA, 15–18 May 2017. 

13. Yiğit, E., A. S. Medvedev, P. Hartogh, Max Planck Institute Martian General Circulation Model (MPI-MGCM), International Conference on Mars Aeronomy, Boulder, CO, USA, 15–18 May 2017. 

14. Terada, K., N. Terada, A. S. Medvedev, E. Yiğit, H. Nakagawa, K. Seki, T. Kuroda, H. Shinagawa, H. Fujiwara, Y. Kasaba, DSMC simulations of internal gravity waves propagating and dissipating in the Martian upper thermosphere and exosphere, JpGU-AGU joint meeting, May 2017. 

15. Panka, P., A. Kutepov, K. Kalogerakis, D. Janches, A. Feofilov, L. Rezac, D. Marsh, and E. Yiğit, New non-LTE model of OH(v) in the mesopshere/lower thermosphere, EGU, 2017. 

16. Yiğit, E., A. S. Medvedev, Effects of small-scale gravity waves of lower atmospheric origin on the mean fields and the migrating diurnal tide in the middle atmosphere and thermosphere, American Geophysical Union, Fall Meeting, San Francisco, Dec 2016. 

17. Yiğit, E., A. S. Medvedev, Lower atmospheric gravity waves as a source of variability in the upper atmosphere, 26th IUGG General Assembly, Prague, 22 June–2 July, 2015. 

18. Yiğit, E., A. S. Medvedev, P. Hartogh, Internal gravity wave processes on Earth and Mars, 26th IUGG General Assembly, Prague, 22 June–2 July, 2015. 

19. Medvedev, A. S., E. Yiğit, T. Kurada, P. Hartogh, Influence of global dust storms on the mesosphere and lower thermosphere of Mars, European Planetary Science Congress, Cascais, Portugal, 7–12 Sept 2014. 

20. Medvedev, A. S., E. Yiğit, T. Kurada, P. Hartogh, Response of the Martian Upper Atmosphere to Lower Atmospheric Dust Storms: GCM Study, 5th International Workshop on Mars Atmosphere: Modeling and Observation, Oxford, UK, 13–16 Jan 2014. 

21. Yiğit, E., A. J. Ridley, M. B. Moldwin, and T. J. Immel, Modeling upper atmosphere variability on various scales under quiet and disturbed solar and geomagnetic conditions, International CAWSES Symposium, Nagoya, Japan, 18-22 Nov 2013. 

22. Yiğit, E., and A. S. Medvedev, Gravity waves in the thermosphere during a sudden stratospheric warming, AGU, Fall Meeting, San Francisco, Dec 2012. 

23. Yiğit, E., and A. S. Medvedev, Tropopause to thermosphere coupling via small-scale gravity waves, COSPAR Scientific Assembly in Mysore, India, July 2012. 

24. Yiğit, E., S. L. England, T. Immel, A. J. Ridley, and A. S. Medvedev, Latitudinal coupling processes in the thermosphere-ionosphere: variations of mass density and ion-neutral coupling, COSPAR Scientific Assembly in Mysore, India, July 2012. 

25. Yiğit, E., A. J. Ridley, M. B. Moldwin, Variability of the thermospheric vertical winds under realistic heliospheric conditions, COSPAR Scientific Assembly in Mysore, India, July 2012. 

26. Andronova, N., E. Yiğit, A. Ridley and J. Kozyra, and E. Rozanov, Linking upper and lower atmospheres: Variability of the polar night turbopause region, 3rd High Energy Particle Precipitation in the Atmosphere (HEPPA) Workshop, Granada, Spain, May 2011. 

27. Yiğit, E., A. S. Medvedev, and A. J. Ridley, Dynamical and thermal effects of gravity waves in the terrestrial thermosphere-ionosphere, AGU Chapman Conference on Atmospheric Gravity Waves and Their Effects on General Circulation and Climate, Honolulu, Hawaii, USA, Feb 2011. 

28. Medvedev, A. S., E. Yiğit, and P. Hartogh, Effects of gravity wave drag in the Martian atmosphere: Simulations with a GCM, The Fourth International Workshop on the Mars Atmosphere: Modelling and observation, Paris, France, Feb 2011. 

29. Yiğit, E., and A. J. Ridley, Variability of thermospheric vertical winds simulated in a nonhydrostatic coupled ionosphere-thermosphere model, 38th COSPAR Scientific Assembly, Bremen, Germany, July 2010. 

30. Yiğit, E., and A. J. Ridley, Effects of high-latitude thermosphere heating at various scale sizes simulated by a nonhydrostatic model, European Geophysical Union General Assembly, Vienna, Austria, May 2010. 

31. Yiğit, E., A. J. Ridley, and M. E. Hagan, Effects of tides on the upper atmosphere simulated by a non- hydrostatic general circulation model, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2009. 

32. Yiğit, E., and A. J. Ridley, Effects of tidal oscillations simulated in a nonhydrostatic general circulation model, SWARM Workshop, Potsdam, Germany, Aug 2009. 

33. Medvedev, A. S., E. Yiğit, A. D. Aylward, P. Hartogh, and M. J. Harris, Effects of internal gravity waves in the thermosphere above the turbopause, American Geophysical Union Joint Assembly, The Meeting of the Americas, Toronto, Canada, May 2009. 

34. Cnossen, I., N. Arnold, M. J. Harris, and E. Yiğit, The modelled impact of changes in the CO2 concentration on the middle and upper atmosphere: sensitivity to gravity wave activity and parameterization, American Geophysical Union, Fall Meeting, San Fransisco, USA, 2007. 

35. Yiğit, E., and A. D. Aylward, Atmospheric wave dynamics in the context of implementation of wave parameterisations, IAGA/ICMA (Vertical Coupling) Workshop, Varna, Bulgaria, Sept 2006. 

36. Yiğit, E., Kinematic modelling of waves in the Earth’s Atmosphere, European Modelling Symposium, UCL, London, UK, Sept 2006. 

37. Yiğit, E., Wave dynamics: Trouble-making waves in the atmosphere, International Conference for Physics Students (ICPS), Bucharest, Romania, Aug 2006. 

38. Yiğit, E., A. D. Aylward, Comperative studies with atmospheric gravity waves (AGWs): Parameterisation and recent modelling studies, Magnetosphere Ionosphere and Solar-Terrestrial (MIST)-UK Solar Physics (UKSP) Workshop, Aberystwyth, Wales, Apr 2006. 

39. Yiğit, E., A. D. Aylward, M. J. Harris, Hybrid-Lindzen-Matsuno gravity wave scheme and implementation into CMAT2, The 12th EISCAT International Workshop, Kiruna, Sweden, Aug 2005. 

Contributed Posters

1. Yiğit, E., A. S.Medvedev,  M. Ern, T. Trinh, Climatology of gravity wave activity in the middle atmosphere as simulated by a whole atmosphere gravity wave parameterization in a GCM and as observed by SABER/TIMED, American Geophysical Union, Fall Meeting, Washington DC., Dec 2018. 

2. Roeten K. S. Bougher, P. Mahaffy, Y. Lee, D. Pawlowski, F. Gonzalez-Galindo, M. Lopez Valverde, E. Yiğit, Comparing MAVEN/NGIMS Thermospheric Wind Observations and M-GITM simulations, American Geophysical Union, Fall Meeting, Washington DC., Dec 2018. 

3. Yiğit, E., A. S. Medvedev, P. Hartogh, Annual variation cycle of GW- induced CO2 cloud formation in Mars middle atmosphere, American Geophysical Union, Fall Meeting, San Francisco, Dec 2016. 

4. Yiğit, E., A. S. Medvedev, A whole atmosphere gravity wave parameterization and its applications to vertical coupling between the lower and upper atmosphere, 2016 SPARC Gravity Wave Symposium, State College, PA, USA, May 2016. 

5. Yiğit, E., A. S. Medvedev, and P. Hartogh, Gravity Wave-induced high-altitude CO2 ice clouds in Mars’ atmosphere, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2015. 

6. England, S. L., E. Yiğit, G. Liu, MAVEN observations of atmospheric waves in the Martian upper atmosphere, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2015. 

7. Yiğit, E., H. U. Frey, M. B. Moldwin, T. J. Immel, and A. J. Ridley, Simulated hemisphere differences in the response of the upper atmosphere to the August 2011 Storm, 26th IUGG General Assembly, Prague, 22 June–2 July, 2015. 

8. Panka, P. A., A. Kutepov, and E. Yiğit, Study of vibrational-vibrational (V-V) energy exchange between CO2 isotopes in the middle and upper atmospheres of Earth and Mars, CEDAR 2015 meeting, 21–25 June 2015, the University of Washington, Seattle, Washington, USA. 

9. Yiğit, E., A. S. Medvedev, A. A. Kutepov, A. G. Feofilov, Impact of an additional radiative CO2 cooling induced by subgrid-scale gravity waves in the middle and upper atmosphere, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2011. 

10. Yiğit, E., A. S. Medvedev, A. D. Aylward, A. J. Ridley, M. J. Harris, M. B. Moldwin, P. Hartogh, Dynamical effects of small-scale gravity waves of lower atmospheric origin on the equinoctial thermosphere, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2011. 

11. Medvedev, A. S., and E. Yiğit, Influence of vertically propagating GWs on the thermosphere of Mars, AGU Chapman Conference on Atmospheric Gravity Waves and Their Effects on General Circulation and Climate, Honolulu, Hawaii, USA, Feb 2011. 

12. Yiğit, E., A. J. Ridley, Role of spatial and temporal variability for the magnitude and structure of thermospheric vertical winds, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2010. 

13. Vichare, G., A J. Ridley, E. Yiğit, Low latitude electrodynamics in Global Ionosphere-Thermosphere Model, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2010. 

14. Toth, G, et al., Improving the physics models in the Space Weather Modeling Framework, American Geophysical Union, Fall Meeting, San Fransisco, USA, Dec 2010. 

15. Yiğit, E., A. S. Medvedev, Gravity waves and their effects in the thermosphere during low and high solar activity, SCOSTEP Symposium, Berlin, Germany, July 2010. 

16. Yiğit, E., A. S. Medvedev, Internal gravity waves in the thermosphere during low and high solar activity: Simulation study, European Geophysical Union General Assembly, Vienna, Austria, May 2010.